Near-threshold production of $a_0(980)$-mesons in $ÏN$ and NN collisions and $a_0/f_0$-mixing

L. A. Kondratyuk; E. L. Bratkovskaya; V. Yu. Grishina; M. Buescher; W. Cassing; H. Stroeher

doi:10.1134/1.1540670

paper

Near-threshold production of $a_{0} (980)$ -mesons in $I ¨ N$ and NN collisions and $a_{0} / f_{0}$ -mixing

arXiv:nucl-th/0207033 · doi:10.1134/1.1540670

Abstract

We consider near-threshold $a_{0} (980)$ -meson production in $I ¨ N$ and $N N$ collisions. An effective Lagrangian approach with one-pion exchange is applied to analyze different contributions to the cross section for different isospin channels. The Reggeon exchange mechanism is also evaluated for comparison. The results from $I ¨ N$ reactions are used to calculate the contribution of the $a_{0}$ meson to the cross sections and invariant $K K ˉ$ mass distributions of the reactions $pp \to p n K^{+} K ˉ^{0}$ and $pp \to pp K^{+} K^{-}$ . It is found that the experimental observation of $a_{0}^{+}$ mesons in the reaction $pp \to p n K^{+} K ˉ^{0}$ is much more promising than the observation of $a_{0}^{0}$ mesons in the reaction $pp \to pp K^{+} K^{-}$ . Effects of isospin violation in the reactions $pN \to d a_{0}$ , $p d \to^{3} He /^{3} H a_{0}$ , and $dd \to^{4} He a_{0}$ , which are induced by $a_{0} (980)$ -- $f_{0} (980)$ mixing, are also analyzed.

43 pages, including 16 eps figures, to be bublished in Phys. Atom. Nucl. (Yad. Fiz.) vol. 65, No. 11 (2002)

Near-threshold production of a0​(980)-mesons in I¨N and NN collisions and a0​/f0​-mixing

Abstract

Near-threshold production of $a_{0} (980)$ -mesons in $I ¨ N$ and NN collisions and $a_{0} / f_{0}$ -mixing